Industrial electric heating furnaces – Arc furnace device – Power supply system
Patent
1982-04-27
1983-08-23
Envall, R.
Industrial electric heating furnaces
Arc furnace device
Power supply system
H05B 000
Patent
active
044008163
ABSTRACT:
A controlled stop circuitry which frees the operator for carrying out other duties of cycle-interrupt time, by being automatically operable, when once activated, to partially raise the electrodes and to open the transformer switch, but only after the electrode current has decreased to a safe value. More particularly, the circuitry when actuated in a designated manner, interrupts an operating cycle by raising the electrodes, while simultaneously sensing the current supplied to them, and is effective, when the current decreases to a safe level, to automatically open the transformer switch and stop movement of the electrodes in partially raised positions. The circuitry also permits, as an option to the above procedure, the carrying out of the above steps, except that it delays opening of the transformer switch until the electrodes reach the top of their travel. The present invention further contemplates a controlled stop circuitry so designed that it can be readily patched into an existing furnace control system in such a manner as to give the operator the option of using the system in its usual fashion, or of using the controlled stop circuitry in its intended fashion.
REFERENCES:
patent: 2717326 (1955-09-01), Gunton
patent: 2773112 (1956-12-01), Grebe et al.
patent: 3823243 (1974-07-01), Vitale et al.
Cascade Steel Rolling Mills, Inc.
Envall R.
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